1914) 
BURT—THELEPHORACEJE OF NORTH AMERICA. III 359 
by the absence of a hyphal subiculum over the area on which 
the fructifications are distributed, and by the less cylindric 
form of fructifications of Cyphella. Cyphella is allied to Meru- 
lius by C. muscigena and also to Craterellus by this species, speci- 
mens of which were described as a Craterellus. 
А few species of Cyphella are common and widely distributed, 
but most of our North American species are apparently ex- 
tremely local and are known only from their respective type 
collections. The lack of specimens available for carrying 
about to compare with types has been a serious disadvantage 
in my study of this genus. Ваза and basidiospores have not 
as yet been found for some species which, although originally 
referred to Cyphella, have to be regarded as even doubtful Basi- 
diomycetes. I have supplemented the original descriptions with 
measurements of dried fructifications and with such data in 
regard to basidia and spores as the specimens afford. In the 
case of very scanty types, the few fructifications are too precious 
for gross comparison to be used for microscopic study. For 
such species, it seems to me that the descriptions should stand 
on the original data, without prejudice, until new collections 
become available. Such imperfectly known and partially de- 
scribed species are grouped together under the heading “Species 
Imperfectly Known." Cyphella convoluta Cke., C. Cupressi 
(Schw.) Fries and C. subcyanea Ell. & Ev. are excluded species. 
KEY TO THE SPECIES 
Fructifications sulphur-colored ; hymenium even; spores 43x21-3 и 1. C. sulphurea 
Fructifications sulphur-colored; hymenium minutely pitted; spores 6-8 x 
КЕНІ... bees ОЛЧЕ uses E a 2. C. leta 
Fructifications white or whitish; on поввев............................ 1 
Fructifications white; not on шоввев................................. 2 
Fructifications neither white nor вшрһиг-сојогей....................... 3 
1. Fructifications helmet-shaped; hymenium slightly wrinkled; spores 10 x 
vou ТЕККЕ РТ M UT 8. C. galeata 
1. Fructifications flattened, irregular in form, sometimes stipitate; spores 3-5 
РР A sae ОР N mee ERE RR 4. C. muscigena 
1. Fructifications seated upon or developing from webby strings of mycelium 
5. C. arachnoidea 
2. Fructifications villose, not easily crushed, with a firm base or a short 
gem; done 12-15 х6-бім................:.....,/2...... 6. C. Tilie 
2. Fructifications villose, easily crushed, sessile; spores 10-12 x 5-7 и 
7. C. villosa 
2. Fructifications whitish, minutely webby-hairy, easily crushed, sessile; 
ккге9-І8кім....................................... 8. С. caricina 
